package com.czy.interceptor;

import com.czy.util.RedisTokenManger;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Autowired
    private RedisTokenManger redisTokenManger;

    /**
     * 预处理回调方法，实现处理器的预处理
     * 返回值：true表示继续流程；false表示流程中断，不会继续调用其他的拦截器或处理器
     */
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        String requestURI = request.getRequestURI();
        System.err.println(requestURI);
        String accessToken = request.getHeader("Authorization");
        String token = request.getParameter("token");
        if (StringUtils.isEmpty(accessToken) && StringUtils.isEmpty(token)){
            request.getRequestDispatcher("/").forward(request,response);
            return false;
        }
        Object userInfoByToken=null;
        if(accessToken!=null){
            userInfoByToken = redisTokenManger.getUserInfoByToken(accessToken);
        }
        Object info=null;
        if (token!=null){
            info = redisTokenManger.getUserInfoByToken(token);
        }
        if (userInfoByToken==null && info==null){
            request.getRequestDispatcher("/").forward(request,response);
            return false;
        }
        return true;
    }

    /**
     * 后处理回调方法，实现处理器（controller）的后处理，但在渲染视图之前
     * 此时我们可以通过modelAndView对模型数据进行处理或对视图进行处理
     */
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    /**
     * 整个请求处理完毕回调方法，即在视图渲染完毕时回调，
     * 如性能监控中我们可以在此记录结束时间并输出消耗时间，
     * 还可以进行一些资源清理，类似于try-catch-finally中的finally，
     * 但仅调用处理器执行链中
     */
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}
